Doc,
That's the general consensus on the MB battery, and probably the only reason to use it is for Concours. That being said, mine has been fine for 3 year so far, including 6-month layups in the winter w/o a trickle charger...
Do a little searching here, a lot use Interstate batteries and if money is no object there is an Optima Gel that fits. You can find the right group sizes in a search...